Rainy Sound comfortable sleep

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[1.2.4]
# Added 2 new music.

[1.2.3]
# Separated the distance between the banner ad and the content.

[1.2.2]
# Environment sound volume settings can now be saved for each scene.

[1.2.1]
# Fixed an issue where the application was forcibly terminated under certain circumstances.

[1.2.0]
# Fixed sound playback process because it crashes in some environment.